... weight, small size,power, high conversion,pure sin wave AC 220V output;3.The power supply system uses microcomputer ... altitude, mountains,.villages without electricity in lighting ,for computer ,mobilephone charging ,small household appliances ... time1Solar moduleImported polycrystalline silicon cell20WP25years2500WDC/AC converterPure sine waveDC 12V AC 220V25years3Storage batteryMaintenance-free lead ...